{"refrec":{"BRefID":311378,"RR":"<b>Fonseca-Batista, D.; Li, X.; Riou, V.; Michotey, V.; Deman, F.; Fripiat, F.; Guasco, S.; Brion, N.; Lemaitre, N.; Tonnard, M.; Gallinari, M.; Planquette, H.; Planchon, F.; Sarthou, G.; Elskens, M.; LaRoche, J.; Chou, L.; Dehairs, F.</b> (2019). Evidence of high N<sub>2</sub> fixation rates in the temperate northeast Atlantic. <i>Biogeosciences 16(5)</i>: 999-1017. <a href=\"https://dx.doi.org/10.5194/bg-16-999-2019\" target=\"_blank\">https://dx.doi.org/10.5194/bg-16-999-2019</a>","BEntID":303740,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Biogeosciences 16(5)</i>: 999-1017. <a href=\"https://dx.doi.org/10.5194/bg-16-999-2019\" target=\"_blank\">https://dx.doi.org/10.5194/bg-16-999-2019</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Fonseca-Batista, D.; Li, X.; Riou, V.; Michotey, V.; Deman, F.; Fripiat, F.; Guasco, S.; Brion, N.; Lemaitre, N.; Tonnard, M.; Gallinari, M.; Planquette, H.; Planchon, F.; Sarthou, G.; Elskens, M.; LaRoche, J.; Chou, L.; Dehairs, F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Fonseca-Batista, D. <i>et al.</i>","Englishabstract":"Diazotrophic activity and primary production (PP) were investigated along two transects (Belgica BG2014/14 and GEOVIDE cruises) off the western Iberian Margin and the Bay of Biscay in May 2014. Substantial <span class=\"inline-formula\">N<sub>2</sub></span> fixation activity was observed at 8 of the 10 stations sampled, ranging overall from 81 to 384 <span class=\"inline-formula\">µ</span>mol N m<span class=\"inline-formula\"><sup>−2</sup></span> d<span class=\"inline-formula\"><sup>−1</sup></span> (0.7 to 8.2 nmol N L<span class=\"inline-formula\"><sup>−1</sup></span> d<span class=\"inline-formula\"><sup>−1</sup>)</span>, with two sites close to the Iberian Margin situated between 38.8 and 40.7<span class=\"inline-formula\"><sup>∘</sup></span> N yielding rates reaching up to 1355 and 1533 <span class=\"inline-formula\">µ</span>mol N m<span class=\"inline-formula\"><sup>−2</sup></span> d<span class=\"inline-formula\"><sup>−1</sup></span>. Primary production was relatively lower along the Iberian Margin, with rates ranging from 33 to 59 mmol C m<span class=\"inline-formula\"><sup>−2</sup></span> d<span class=\"inline-formula\"><sup>−1</sup></span>, while it increased towards the northwest away from the peninsula, reaching as high as 135 mmol C m<span class=\"inline-formula\"><sup>−2</sup></span> d<span class=\"inline-formula\"><sup>−1</sup></span>. In agreement with the area-averaged Chl <span class=\"inline-formula\"><i>a</i></span> satellite data contemporaneous with our study period, our results revealed that post-bloom conditions prevailed at most sites, while at the northwesternmost station the bloom was still ongoing. When converted to carbon uptake using Redfield stoichiometry, <span class=\"inline-formula\">N<sub>2</sub></span> fixation could support 1 % to 3 % of daily PP in the euphotic layer at most sites, except at the two most active sites where this contribution to daily PP could reach up to 25 %. At the two sites where <span class=\"inline-formula\">N<sub>2</sub></span> fixation activity was the highest, the prymnesiophyte–symbiont <i>Candidatus</i> Atelocyanobacterium thalassa (UCYN-A) dominated the <i>nifH </i>sequence pool, while the remaining recovered sequences belonged to non-cyanobacterial phylotypes. At all the other sites, however, the recovered <i>nifH</i> sequences were exclusively assigned phylogenetically to non-cyanobacterial phylotypes. The intense <span class=\"inline-formula\">N<sub>2</sub></span> fixation activities recorded at the time of our study were likely promoted by the availability of phytoplankton-derived organic matter produced during the spring bloom, as evidenced by the significant surface particulate organic carbon concentrations. Also, the presence of excess phosphorus signature in surface waters seemed to contribute to sustaining <span class=\"inline-formula\">N<sub>2</sub></span> fixation, particularly at the sites with extreme activities. These results provide a mechanistic understanding of the unexpectedly high <span class=\"inline-formula\">N<sub>2</sub></span> fixation in productive waters of the temperate North Atlantic and highlight the importance of <span class=\"inline-formula\">N<sub>2</sub></span> fixation for future assessment of the global N inventory.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Evidence of high N<sub>2</sub> fixation rates in the temperate northeast Atlantic","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2019,"MonPub":null,"DateUpdate":"2019-06-03","DateCreate":"2019-05-28","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000461174100003","VABBcode":null,"OpenAcc":1,"DOI":"10.5194/bg-16-999-2019"},"refs":null,"anarec":{"AnaID":311378,"PubliDate":2019,"Pagination":"999-1017","XtraPublOfAnaID":null,"ISBN":null,"Volume":"16","Issue":"5","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":68092,"SerRR":"<b>Gattuso, J.P.; Kesselmeier, J. 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